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. 2020 Sep 4;11:1953. doi: 10.3389/fmicb.2020.01953

FIGURE 4.

FIGURE 4

Rarefied OTU accumulation curves for all fungi and ectomycorrhizal, saprotrophic and plant pathogenic groups therein. Solid and dashed lines indicate inclusion and exclusion of sample-wise singletons (one sequence in a sample) in samples, respectively. These singletons are locally rare OTUs that may potentially represent index-switching artifacts.